[RE-wrenches] Sol-Ark with 800A Service

[Kirk Herander]

As an aside, I ran into this with a Fortress True 12kw. (As of several
months ago) They have not tested parallel CTs, nor have they tested single
CTs in any service above 200A. They would not approve my plan to
parallel CTs on a parallel conductor, 400A service.

Fortress does have an input for a 3rd party meter, who knows if it's been
developed, maybe Sol-Ark does too.

Definitely run it past Sol-Ark first.



On Thu, Jul 18, 2024 at 7:46 AM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> You should be able to parallel 6 CTs (3 per phase) as long as you get the
> phases and directions right. The question really comes down to whether the
> Sol-Ark can handle the current from 800A at the CT ratio (which I believe
> is 2000:1). For practical purposes, on an 800A service, particularly
> residential, you will probably never see more than 600A, so it would
> probably be fine.
>
> But I would like to know what Sol-Ark says about this. It does not appear
> to be documented. For the 30K and 60K they have recommended CTs for up to
> 1200A. I'm not sure if 600A measurement is a hard limit for the 15K
> considering that's the largest single CT they specify in their
> documentation.
>
> Jason
>
>
> On Thu, Jul 18, 2024, 7:23 AM Chris Sparadeo <sparadeo.chris at gmail.com>
> wrote:
>
>> Hi Jason,
>>
>> Sorry for not clarifying. This is a export limited scenario, so CTs would
>> still be required.
>>
>>
>>
>> On Thu, Jul 18, 2024 at 6:51 AM Jason Szumlanski <
>> jason at floridasolardesigngroup.com> wrote:
>>
>>> This may or may not be helpful, but are you sure you need the CTs? They
>>> are not always required. You would need them for power export limiting or
>>> grid peak shaving, but for straight grid-tied with or without battery
>>> backup, you don't need them.
>>>
>>> Jason Szumlanski
>>> Florida Solar Design Group
>>>
>>>
>>>
>>>
>>> On Wed, Jul 17, 2024, 8:41 PM Chris Sparadeo via RE-wrenches <
>>> re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>>> Hey there wrenchers,
>>>>
>>>> I am working on a larger project with 6 Sol-Ark 15K units and an 800A
>>>> service. The main service conductors are 3 parallel runs of 400 kcmil. I am
>>>> wondering how to CT these conductors from the master inverter. Sol Ark tech
>>>> support has not been very helpful so far. I have the included 300A CTs
>>>> ....and I do know that they make a 600A CT, but its physical size and
>>>> rating aren't a good fit. Does anyone have experience with either a Sol Ark
>>>> or third party CT that might fit this 800A configuration?
>>>>
>>>> Kindly,
>>>>
>>>> Chris Sparadeo
>>>>
>>>>
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-- 

*Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*

*Owner|Principal, VT Solar, LLC*

*Celebrating our 33st Anniversary 1991-2024!!*

dba Vermont Solar Engineering

802.559.1225
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